Thorne Cal Mag Citrate + Vitamin C is a 7.5 oz effervescent powder supplement that provides calcium, magnesium, and vitamin C for stress relief.

Cal-Mag Citrate Effervescent Powder helps maintain normal bone and muscle health.* It also provides vitamin C. It effervesces when mixed with water, creating optimally absorbed minerals.* NSF Certified for Sport

Thorne Bestseller

Thorne has been trusted by health-care practitioners, U.S. National Teams, and families around the world for more than 30 years. Thorne Bestsellers are a testament to Thorne's mission to provide high-quality supplements that are tested for quality, safety, and efficacy.

Unique Formula

The ratio of calcium and magnesium is designed for individuals who need higher amounts of calcium but can’t tolerate an equal amount of magnesium due to its laxative-like characteristic.*

Convenient Protocol

The powder form is easy to consume, mixes well into drink of choice, and is convenient to take.

Purest Ingredients

There are no unnecessary fillers or additives in Thorne products. Thorne is committed to providing high-quality supplements that contain research-backed ingredients, in efficacious amounts, that retain the potency to meet label claims until the day of expiration.

We don’t give much thought to our bones – until we break one. Although we might think of our bones as inert structures – as scaffolding that holds us up, as protection for the body’s organs, and the structure that allows us to move about – bones are crucial to many more functions than that. Because our bones are living, dynamic, and constantly changing tissues, maintaining proper bone health is important. Nutritional supplements provide essential support for bone health.* The four most important nutrients for supporting bone health are two vitamins and two minerals – vitamins D and K and calcium and magnesium.* These four nutrients help each other do their jobs, including sending calcium to the bones and keeping it out of the arteries, kidneys, and other soft tissues.*

When the highest standards have been met, Thorne creates higher ones.
Sourcing Exceptional Ingredients

We develop better standards for higher quality ingredients. Thorne cares deeply about where our ingredients come from. We partner only with suppliers whose practices emphasize quality, science, and responsibility. Better ingredients means better potency, absorption, and digestibility – and ultimately better health.

Manufacturing the Right Way

We produce our own products to ensure full supply chain transparency. For more than 30 years, we have invested in clean manufacturing practices. We refuse to use ingredients that can inhibit absorption. We perform our final production in the United States. Our Charleston, SC facility is third-party certified.

Four Rounds of Testing

We run four rounds of testing for each of our products. We have invested in two state-of-the-art in-house laboratories that allow us to conduct four rounds of testing, while most competitors test only one or two times. We test our raw materials, in-process batches, finish products, and product stability for each product.

Thinking Sustainably

We're thinking sustainably to protect our environment. We believe the environment should never be compromised for the sake of business gain. At Thorne, we believe that doing our part to protect the environment and its most valuable resources goes hand in hand with our product quality standards.